Canadian cheers piece of vocal music (7)
I believe the answer is:
cantata
'piece of vocal music' is the definition.
'cantata' can be an answer for 'music' (cantata is a kind of music). I'm not certain of the 'piece of vocal' bit.
'canadian cheers' is the wordplay.
'canadian' becomes 'can' (I've seen this in other clues).
'cheers' becomes 'tata' (both can mean goodbye).
'can'+'tata'='CANTATA'
Can you help me to learn more?
(Other definitions for cantata that I've seen before include "piece of music" , "Oratorio on a sacred theme" , "Vocal work with orchestra" , "Work for accompanied voice" , "Choral work" .)